The epidemiology of Plasmodium falciparum malaria in two Cameroonian villages: Simbok and Etoa.

In support of ongoing immunologic studies on immunity to Plasmodium falciparum, demographic, entomologic, parasitologic, and clinical studies were conducted in two Cameroonian villages located 3 km apart. Simbok (population = 907) has pools of water present year round that provide breeding sites for Anopheles gambiae, whereas Etoa (population = 485) has swampy areas that dry up annually in which A. funestus breed. Results showed that individuals in Simbok receive an estimated 1.9 and 1.2 infectious bites per night in the wet and dry season, respectively, whereas individuals in Etoa receive 2.4 and 0.4 infectious bites per night, respectively. Although transmission patterns differ, the rate of acquisition of immunity to malaria appears to be similar in both villages. A prevalence of 50-75% was found in children < 10 years old, variable levels in children 11-15 years old, and 31% in adults. Thus, as reported in other parts of Africa, individuals exposed to continuous transmission of P. falciparum slowly acquired significant, but not complete, immunity.     

Insulinotropic and anti-inflammatory effects of rosiglitazone in experimental autoimmune diabetes

Cytokines and nitric oxide (NO) are involved in the pathogenesis of autoimmune diabetes mellitus (DM). Rosiglitazone is an insulin-sensitizing drug that is a ligand for the nuclear receptor peroxisome proliferator-activated receptor-gamma (PPAR-γ). The anti-inflammatory and immunomodulating properties of PPAR-γ have been documented. The aim of this study is to investigate the effectiveness of rosiglitazone in autoimmune DM and to clarify the possible mechanism(s) involved. Autoimmune DM was induced in adult male Balb/c mice by co-administration of cyclosporin A and multiple low doses of streptozotocin. Diabetic mice were treated daily with rosiglitazone (7 mg/kg, p.o.) for 21 days. Blood glucose level (BGL), serum insulin level and pancreatic levels of tumor necrosis factor-alpha (TNF-α), interferon-gamma (IFN-γ) and NO were measured. Histopathological examination and immunohistochemical determination of CD4 and CD8 T lymphocytes in the pancreatic islets were performed. In addition, analysis of pancreatic protein expression was carried out. The results showed that rosiglitazone treatment resulted in a significant decrease in the BGL and the pancreatic levels of TNF-α, IFN-γ and NO compared to diabetic mice. The serum insulin level was significantly increased after rosiglitazone treatment compared to diabetic mice. The destroyed pancreatic islets were regenerated and became free from both CD4 and CD8 T cells after treatment. Furthermore, many changes in pancreatic protein expression were observed. These results suggest that rosiglitazone has a beneficial effect in the treatment of autoimmune diabetes, an effect that seemed to be a secondary consequence of its anti-inflammatory and immunomodulating properties and might be reflected at the level of protein expression.     

Doppler ultrasonographic evaluation of splanchnic blood flow in coeliac disease.

BACKGROUND: Current knowledge on splanchnic haemodynamics in coeliac disease is limited and incomplete. AIM: To evaluate splanchnic arterial and venous blood flow in coeliac disease. METHODS: In 22 coeliac (13 untreated, nine treated) patients and in nine healthy subjects the following variables were assessed: vessel diameter and mean flow velocity in portal vein, splenic vein, superior mesenteric vein, and superior mesenteric artery. Peak systolic velocity, end diastolic velocity and pulsatility index were also determined in the superior mesenteric artery. Five patients of the untreated group were re-evaluated after nine months on a gluten free diet. RESULTS: Significant differences in haemodynamic variables between the three groups were shown only in the superior mesenteric artery. An increase in both mean flow velocity and end diastolic velocity and a reduction in pulsatility index occurred in untreated patients compared with treated patients (p < 0.002; p < 0.04; p < 0.035) and with healthy controls (p < 0.001; p < 0.025; p < 0.0003). Similar results were obtained for the five patients evaluated before and after treatment (p < 0.03; p < 0.02; p < 0.03), in whom the mean flow velocity in the superior mesenteric vein also decreased after treatment (p < 0.05). No significant differences were noted between treated coeliac patients and healthy controls. CONCLUSIONS: In untreated coeliac disease there is a hyperdynamic mesenteric circulation that decreases after treatment.     

Additional health and development activities for community‐directed distributors of ivermectin: threat or opportunity for onchocerciasis control?

We studied the involvement of community-directed distributors (CDDs) of ivermectin for onchocerciasis control in other health and development activities in Nigeria, Togo and Cameroon. Most CDDs (82%) were involved in additional activities, especially EPI, water and sanitation and community development projects. These activities did not take up much time and were not considered an important burden. Ivermectin treatment coverage did not decline with increasing number of additional activities. Other health programmes are interested in building on the experiences and structures of community-directed treatment with ivermectin and involving CDDs in their health programmes. Some, such as EPI, provide financial incentives. Incentives by other programmes may enhance the performance of CDDs when they are selected on the basis of their CDD status. CDDs, health personnel and community members have very positive attitudes towards greater involvement of CDDs in additional health and development activities. We conclude that additional activities for CDDs do not pose a threat to but rather provide an opportunity to strengthen sustainability and effectiveness of ivermectin treatment.     

Enterohepatic circulation of bile acids after cholecystectomy.

Bile acid metabolism was investigated in 10 patients after cholecystectomy, 10 gallstone patients, and 10 control subjects. Diurnal variations of serum levels of cholic and chenodeoxycholic acid conjugates were not abolished by cholecystectomy. Cholic acid pool size was significantly reduced in cholecystectomised patients and the fractional turnover rate and the rate of intestinal degradation of bile acid showed a significant increase. In cholecystectomised patients fasting bile was supersaturated in cholesterol, though less than in gallstone patients, but, in both, feeding resulted in improvement of cholesterol solubility in bile. These data suggest that after cholecystectomy the small intestine alone acts as a pump in regulating the dynamics of the enterohepatic circulation of bile acids and that the improvement of cholesterol solubility in bile is due to a more rapid circulation of the bile acid pool in fasting cholecystectomised patients.     

The road to recovery: Egypt's healthcare reform

As many industrial and third-world countries recover from the severe economic crisis of a global recession, they continue to struggle with its negative effect on their healthcare systems. Healthcare reform has become a leading policy agenda item for most countries. This is especially true for countries in the developing world who are struggling to allocate very limited resources to meet the growing health needs of their residents and the expectations of global health. In the late 1990s, the Egyptian government, in conjunction with the United States Agency for International Development, initiated a Health Sector Reform Program (HSRP) to completely reform the way healthcare was financed, organized and delivered with the intent to extend healthcare coverage to all of its citizens. Although some successes have resulted from the HSRP, Egypt's new government leaders will need to be informed on policies that may more effectively improve the health of the Egyptian population.     

Reliability of Faculty Clinical Evaluations of Non-Emergency Medicine Residents during Emergency Department Rotations

Objectives: To assess the reliability of faculty evaluations of non-emergency medicine (non-EM) residents during clinical ED rotations and to determine the effect that the “leniency” of grading by these evaluators had on the residents' final evaluations. Methods: A prospective, observational study of the evaluation patterns of EM faculty was performed in an academic ED (50, 000 visits yearly census). Each resident was evaluated on a daily basis by a board-certified or board-prepared emergency physician. The evaluation form rated 7 characteristics, but only the rating for overall clinical competence was used for data analysis. If an attending evaluated the same resident more than once, only the first evaluation was used to avoid bias from prior exposure. The scoring patterns of the evaluators, both individually and in groups, were analyzed using 1-way analysis of variance. Evaluator leniency was estimated using the mean evaluator score across all residents. Since each resident was evaluated by a different combination of evaluators, evaluator leniency for each resident was estimated from the mean leniency of the evaluators who specifically assessed that resident. Results: During the period of the study, 66 residents rotated through the ED, yielding a total of 401 evaluations. When the scoring patterns of individual evaluators were analyzed, a high degree of variability was found in the mean scores (range 5.23–8.09) and SDs (range 0.45–1.55) across evaluators; p = 0.0001. There was a moderate correlation between the mean overall competence score received by each resident and that resident's evaluators' leniency, r = 0.52; p = 0.0001. Conclusions: There is significant variability in the scoring patterns of individual evaluators. The evaluators in this study showed large variations in both leniency (as measured by their mean score) and range restriction (as measured by their SD). The differences in evaluator scoring leniency have a moderate correlation with the overall score received by the resident.     

Tenofovir disoproxil fumarate for prevention of HIV infection in women: a phase 2, double-blind, randomized, placebo-controlled trial

Objectives: